Belt-pulley.



:Patented .Tune 9, 1903i.-A

PATENT OFFICE.-

PHILIP Manni-ir, or Sr. Louis, MISSOURI.

BELT-PULLEY.'

SPECIFICATION forming part of Leiters Patent No. vsoeaeated rime 9,1903.

Application iiled November 24, 1902. Serial No. 132,634. (No model.)

shown a split belt-pulley in which the rim is composedof a series ofWooden rings divided into segments and secured together on each side ofa middle ring similarly formed,bnt of somewhat greater depth, and inwhich the Wooden Spokes are formed with tenons on their outer endsttingvdovetailed mortises in the middle-ring.` In the pulley describedin my application referred to the inner ends of the spokes extend tothe' bore and are beveled so as to closely t around the bore, beingsecured in place by fiat hub-sections held together by bolts, whichserve to clampthe inner ends of the spokes directly against the `shaftor bushing. When a pulley of this classv is made of very large diameter,clampingbolts which merely produce a frictional connection by pressureon the shaft or bushing are found to be insufcient to withstand thestrain incident to the long leverage in large pulleys, and it has beenfound necessary. to provide the hub of the pulley when of large diameterwith a key or similar locking device which will enable the pulley to beattached to the shaft Without danger of slipping. 1When a key isemployed, no bushings are used, the hub being brought into directcontact with the shaft and being grooved to receive the key, which alsofits a groove in the shaft.

The object of my invention is to construct a pulley of large diameterwith a split Wooden rim and wooden spokes, each of which is of`comparatively small cross-section and two of which on opposite sides ofthe bore are di-` vided, and to connect these spokes at their innerendsby a divided hub adapted to be keyed to a shaft and of suitableconstruction to hold the inner ends of all the spokes in proper relationaround the bore, While permitting the two sections of the pulley to bereadily attached or detached when necessary.

In carrying out my invention the rim and spokes of the pulley may beconstructed and vconnected in'pihe same manner as that shown v.in mybefore-mentioned application. The

pulley may be divided ina similar Way; but

the vinner ends 'of the spokes instead of being attached to hub-sectionsapplied to their opposite Sides only are connected with a hub formedwith seats to receive the inner ends of the spokes and with flanges thatare attached to the opposite sides'thereof. One of the hub-sections iskformed with a groove for a key, and two of them are provided withsupporting-danges forY the inner portions of the divided spokes, withperforated ears for the clamping-bolts and with anges for confiningtheother two sections of the hub,which consist merely of liatsemicircular plates adapted to be bolted to the sides of the spokes.

In the'accompanying'drawings, Figure lis a perspective view of-aspiitWood pulley em bodying my improvements. Fig. 2 shows a side elevation ofa portion of the pulley with parts in section and parts broken away. 1Fig. 3 is a perspective view of the hub with the upper and lowersections separated and With parts broken away. Fig. 4 shows an elevationof one of the fiat plates constituting one of the hub members.` Fig. 5shows a section on the line 5 5 of Fig. 2 with the shaft omitted.

The rim A of the pulley is made up ofa series of Wooden rings a, placedside by side and secured together, each ring being com? posed of aplurality of segments, which break joints with the segments in theadjacent rings in the usual Way. The middle ring a; of the rim'is madedeeper than the others, and the Spokes or arms B of the pulley areformed with dovetailed tenons b on their outer ends, which engagecorresponding mortises in the middle ring. Each spoke is secured to themiddle ring by means of screws C, which are passed radially inward fromthe outside of the ring into the tenons. Preferably the joints `of thesegments composing the ring are made at the ends of the spokes, and theends of the segments which overlap the ends of the spokes are attachedthereto by the screws C.

The pulley is split or divided into two equal parts, the line ofdivision running straight ssl ICO

.groove d5 to receive the key F.

through the axis of the hub, through two of the arms or spokes,andthrough diametrically opposite portions of the rim. The two dividedspokes are preferably made somewhatlarger in cross-section than theothers in order that each section of the divided spoke may be ofsuicient size to afford the requisite Strength. The outer portions ofthe divided spokes iit closely together, as indicated in Fig. 2, andtransverse bolts H are provided, arranged close to the riln to connectthe spoke-sections. Between these outer portions and the bore thedivided spoke-sections are separated a slight distance by spaces 71,which will allow the bore to be expanded and contracted sufficientlywhen securingthe pulley to, taking it from, or adjusting it on theshaft. The inner portions of the spokes B are brought together aroundthe bore or shaft-opening and are closely itted by being beveled at b onlines radial to the axis of the pulley. The spokes do not extendfquiteto the bore or shaft-opening, but rest onse'ats formed in the hub.'

The hub is formed of metal in order thatit may be securely keyeddirectlyto theshat'tand in order that it may hold firmly the inner endsof the spokes. As before stated, I prefer to employa metal hnb when thepulley is of large diameter. accompanying drawings are of propel'relative dimensions for a pulley having a diameter of forty-eight (48)inches. The same general construct-ion may be employed in pulleys oflarger diameter. Those of smaller diameter may have wooden hubs,although sometimes wooden hubs may be used in pulleys of fortyeight (4S)inch diameter, or thereabout, and I may sometimes employ metal hubs inpulleys of smaller diameter. My object is to use wood whenever possible;but when it is necessary to key the pulley to the shaft I preferablyalways use a metal hub.

As shown most clearly in Fig. 3, the hub is formed in four parts, therebeing two parts D D of similar shape and size and two parts E E whichare alike in all respects. Each part D or D is formed with a bodyportion, having fiat seats d for the inner ends of the "spokes, flangesd constituting supports for the inner portions of the divided spokes,and avilat semicircular vertical flange d2, adapted to lie against thespokes on one side of the pulley. At each end and on opposite sides ofthe fiange d2 the .body portion of the section D or D is formed with aflange d3, provided with lugs d4, having holes for the clamping-bolts.Each casting D D' is formed with a semicircular recess to fit one-halfof the shaft, and one of them is formed with a The two remainingsections E E of the hub are of the kind illustrated in Fig. 4, eachbeing of a general semicircular form and provided with a recess e,adapted to receive the body portion of the sections D D.

The parts of the pulley shown in the- In connectin g the hub-sections tothe spokes the latter have their inner ends placed against the seats d,with their inner portions lying close to the flanges d2. The innerportions of the divided spokes are fitted to the Hanges d in the mannerindicated in Fig. 2.' The plates E E' are then applied to the oppositesides of the spokes, being dropped in behind the anges d3, and themembers D D and E E are connected by bolts G, that extend parallel withthe axis of the pulley through the hub members and through the spokes.The wedge-shaped bracing-blocks I shown in the drawings are similar tothose shown in my application above mentioned.

It will be observed by reference to Fig. 2 that when the parts areassembled the `hub has the [ianges d' arranged opposite to each otherand that the members of the divided spokes are supported by theseflanges on opposite sides ofthe line of division. The hubsections D andD are connected by` four clamping-bolts J, arranged on opposite sides ofthe pulley and on opposite sides of the axis thereof. The pulley may beclamped on the shaft by means of these bolts; but such a connectionwould not be found to be sufficient for all purposes, and therefore thekey F is employed. Both the clamping-bolts and the key therefore serveto connect the pulley with the shaft; but the main purpose of theclamping-bolts is to secure the two parts of the pulley together at theinner ends of the spokes, the outer ends of the spokes being connectedby the bolts H. The spokes are of approximately the same width as themiddle ring as. Their cross-section is comparatively small, andtherefore the pulley will run easily without such agitation of the-airas is incident to pulleys having thickV wide arms. Preferably the edgesof all the parts of the pulley are rounded off in order to present anattractive appearance.-

The pulley is applied to, taken from, or adjusted on a shaft in much thesame way as pulleys of a similar class; but the method of connecting theinner ends of the spokes where two of them are divided to a sectional orseparable hub is believed to be novel and to possess materialadvantages.

I claim as my invention-a 1. In a belt-pulley wherein the rim is composed of wooden segments and the spokes are of wood, and wherein the rimand two of the spokes are divided transversely diametrically through theaxis of the pulley, the combination with the spokes of a metal hubcomprising two hub-sections each formed with a body portion having seatsfor the inner ends of the spokes, laterally-projecting iianges supporting the inner ends of the divided spokes, a iiange arranged at rightangles to said laterally-projecting iianges and lying against the spokeson one side,and anges and perforated lugs on opposite ends of the bodyportion; and two other hub-sections each consisting IIO of 'platesecured to one side of the spokes, and having its innerl edge arrangedbetween the spokes and one of the end flanges of the body portion of oneof the first-'mentioned hub-sections.

2. In a belt-pulley, the combination of a divided rim composed of middlesegments and segments on each side thereof ot' less depth; solid spokesof substantially the same thickness as the middle segments and securedthereto, two divided spokes secured to the middle segment on oppositesides of the dividing-line of the rim and each having the outer ends ofits two parts in eontaet close to the rim and bolted together, and ametal hub to which the inner ends of the spokes are secured, comprisingtwo hub sections each formed with a bodyA portion having seats for theends of the spokes, laterally-projecting A PHILIP MEDART. Witnesses:

A. M. PARKINS, '.I. A. MAoDoNALn.

